There are 2 paths to ITIL 4 certification. If you have no previous ITIL training/certifications, hold the ITIL V3 Foundation Cert only or have less than 17 ITIL V3 credits, then you have to start with the ITIL 4 Foundation course.

If you hold 17 or more ITIL V3 credits or are an ITIL Expert, then you get to jump straight to what they are calling the ITIL 4 Managing Professional Transition course (think of it as a bridge course). This allows you to take 1 course and 1 exam to become Managing Professional certified instead of 5 courses and 5 exams and will save you tons of money.